Hi Guys and thanks for the feedback postings.
I know It's a bit hard and there isn't a true need fot it if not for one or 2 systems right now....but what about a retro/direct control via CA3? I'm sure I can Use the CA3 with a Controller that has the retro/direct shifting function, using the manual actuator, but that means the software for the autoshift is manged by the controller....while passing thru the CA could mean to have the ability to set the autoshift accordingly with Other CA setups/sensors/presets....
Just to make sure I understand you right, you want a signal that basically reverses the motor direction of a 2-speed retro-direct motor transmission based on certain CA parameters? What is the actual nature of the input signal on the reversable controller that you are running in these systems, is it a simple 0-5V or 0-3.3V digital logic input?
I'm pretty sure that having deeply researched on the 2 speed retro direct design, Justin, you've even mulled about to implement the shifting option thru the CA3 platform....
Indeed you got me there
There aren't any 'spare'' input/output ports on the CA3, so to do this would require re-purposing one of the existing signal lines to be an output instead of an input, and the only one really available for this would be the "D" PAS direction signal line. Or I suppose the thermistor input could be set as an output too, and then there would still be the ability to have a directional sense via the PAS sensor of your pedal direction so you could have a "backwards pedal to shift gear" option, kinda like an electrical version of the old kick-shift 2 speed hubs!
Another field to pay attention for the CA, from my point of view, is the actual ability to leave a little residual to get an idling-style function, that's useful for high powered RC builds, to avoid surges and attenuate the freewheel idling noise at low to 0 power levels, I mean really single digit watts; since I think this way to use the CA was not in the original intents, sure, there is something to do to make it works better than now....could be to shut off completely the residual after say X seconds of continued braking and 0 speed, and reapply it at next throttle or speed variation....or other features.
Yes, another feature that I've thought heavily about over the years
. You can actually experiment with this now by setting up your system to have a power (watts) throttle and setting your min throttle input to be slightly lower than the actual throttle off voltage. So if your throttle is sitting at 0.9V, put your min throttle input at say 1.0V, so when you let go of the throttle it is at about 4%. If your max power is set to 1000 watts, then when you let go of the throttle it would still be commanding 40 watts from the motor, which is about what it takes to spin a motor unloaded. You'd definitely also want to have the ebrakes wired up so you can shut the motor off completely as well, probably via a handlebar on/off switch.
Another way would be to use the autoPAS mode with a PAS sensor, but have the PASWatts be your low double digits value to keep the motor spinning. Then at least when you turn the bike on it won't be putting a small amount of power through the motor. It's only when you are pedaling then the motor would spin up to speed to be engaged but not provide much power, and then use your throttle when you actually want power output.
If you have a setup and can play around with this first to see how it works, then that would help determine if it's worth including as a build-in feature. We'd add a parameter for "idle watts", and whenever the speed > 0 and the ebrakes are not pressed, then the CA would be commanding this small baseline power. Eliminates the effect of cogging torque in a DD motor so that it feels like a perfect freewheel, and keeps a geared or mid-drive motor engaged so that there is no transmission shock when the motor spins up to speed.
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, thanks ES!) with Grin all-axle front hub, Phaserunner controller, and 52V 19Ah Cellman triangle pack
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